Re: DSolve problem

• To: mathgroup at smc.vnet.net
• Subject: [mg60106] Re: [mg60103] DSolve problem
• From: Bob Hanlon <hanlonr at cox.net>
• Date: Fri, 2 Sep 2005 06:37:40 -0400 (EDT)
• Sender: owner-wri-mathgroup at wolfram.com

```You have mixed the variables x and t.  It is not clear what you want.  Here are
the likely fixes

eqn1=y'[x]==Sin[t]-2y[x];

soln1= DSolve[eqn1,y[x],x][[1,1]]

y[x] -> C[1]/E^(2*x) + Sin[t]/2

eqn1 /. {soln1,D[soln1,x]} // Simplify

True

eqn2 = y'[x]==Sin[x]-2y[x];

soln2 = DSolve[eqn2,y[x],x][[1,1]]

y[x] -> C[1]/E^(2*x) + (1/5)*(2*Sin[x] - Cos[x])

eqn2/. {soln2,D[soln2,x]} // Simplify

True

Bob Hanlon

>
> From: "sunnewton" <sunshinenewton at gmail.com>
To: mathgroup at smc.vnet.net
> Date: 2005/09/02 Fri AM 04:33:05 EDT
> Subject: [mg60106] [mg60103] DSolve problem
>
> Hi,
> I am a freshman of Mathematica, I need help here...
>
> I met such problem as:
>
> DSolve[y'[x] == sin[t] - 2y[x], y[x], t]
>
> DSolve::"dvnoarg": "The function \!\(y[x]\) appears with no arguments."
>
> How to Handle???
>
>

```

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